rapidity
/ɹəˈpɪd.ɪ.ti/ noun
Forms rapidities
- noun speed, swiftness; the condition of being rapid
- noun (relativity) A measure of velocity relative to the speed of light; defined as artanh(v), where artanh is the hyperbolic arctangent, and v = speed (with c = speed of light = 1).
- noun (physics) A measure of the velocity of a particle in a beam relative to the beam's axis
Synonyms
Etymology
From rapid + -ity, from French rapidité, from Latin rapiditas.
Webster’s 1913
- noun The quality or state of being rapid; swiftness; celerity; velocity; as, the rapidity of growth or improvement.
Etymology [L. rapiditas: cf. F. rapidité.]
Sources: Wiktionary · WordNet 3.0 · Webster’s 1913 — from the Wiktionary entry “rapidity”, CC BY-SA 4.0. Details